US7560494B2ExpiredUtilityPatentIndex 92
Rapid low-foam wetting agents for hydrophobic surfaces
Est. expiryApr 30, 2024(expired)· nominal 20-yr term from priority
C11D 1/722C09K 23/00C09K 23/018C11D 1/8255C11D 1/72C09K 23/42
92
PatentIndex Score
48
Cited by
8
References
13
Claims
Abstract
The present invention relates to the use of surfactants of the general formula (I) R—O-(A) n -(B) m -H (I) where R is a C 8 -alkyl radical, A is propylenoxy, B is ethylenoxy, n is an average value of from 0.8 to 2.0 and m is an average value of from 2.0 to 5.0 as a wetting agent for hydrophobic polymer surfaces, and to a wetting agent comprising a) from 0.5 to 50% by weight of at least one surfactant of the general formula (I) according to claim 1, b) from 1.0 to 10% by weight of a C 8 -alcohol and c) from 0.5 to 30% by weight of a compound of the general formula (IV) R—O-(A) n -H (IV) where R is a C 8 -alkyl radical, A is propylenoxy and n is an average value of from 0.8 to 2.0.
Claims
exact text as granted — not AI-modified1. A wetting agent comprising:
a) from 0.5 to 50% by weight of at least one surfactant of formula (I)
R—O-(A) n -(B) m -H (I)
where
R is a C 8 -alkyl radical,
A is propylenoxy,
B is ethylenoxy,
n is an average value of from 1.3 to 1.6, and
m is an average value of from 2.8 to 3.2,
b) from 1.5 to 5.0% by weight of a C 8 alcohol, and
c) from 0.5 to 30% by weight of a compound of formula (IV)
R—O-(A) n -H (IV)
where
R is a C 8 -alkyl radical,
A is propylenoxy, and
n is an average value of from 1.3 to 1.6; and the remaining % by weight being solvent.
2. The wetting agent according to claim 1 , wherein R in components a) and c) is the alkyl radical derived from 2-ethylhexanol.
3. The wetting agent according to claim 1 , wherein components a), b) and c) derive from the identical C 8 alcohol.
4. The wetting agent according to claim 1 , wherein components a), b) and c) are present in amounts of:
a) from 5.0 to 30% by weight,
b) from 1.5 to 5% by weight, and
c) from 2.0 to 20% by weight.
5. The wetting agent according to claim 1 , wherein the C 8 alcohol is 2-ethylhexanol.
6. The wetting agent according to claim 1 , wherein components a), b) and c) are present in aqueous solution.
7. The wetting agent according to claim 1 , wherein said wetting agent has a wetting performance WP PE according to formula (II)
W
P
PE
=
cos
φ
surfactant
solution
,
10
s
-
cos
φ
dist
.
water
1
-
cos
φ
dist
.
water
,
(
II
)
of greater than 0.41, wherein
φ surfactant solution, 10s is the contact angle of a drop of a 0.02% by weight aqueous surfactant solution at 40° C. on a polyethylene surface 10 seconds after the drop hits it, and
φ dist. water is the contact angle of a drop of distilled water at 40° C. on a polyethylene surface 10 seconds after the drop hits it.
8. The wetting agent according to claim 7 , wherein said wetting agent has a wetting performance WP PE of greater than 0.58.
9. The wetting agent according to claim 7 , wherein said wetting agent further has a wetting rate WR PE according to formula (III)
W
R
PE
=
cos
φ
surfactant
solution
,
50
ms
-
cos
φ
dist
.
water
1
-
cos
φ
dist
.
water
·
1
W
P
PE
,
(
III
)
of greater than 0.85, wherein
φ surfactant solution, 50 ms is the contact angle of a drop of a 0.02% by weight aqueous surfactant solution at 40° C. on a polyethylene surface 50 milliseconds after the drop hits it.
10. The wetting agent according to claim 9 , wherein said wetting agent has a wetting rate WR PE of greater than 0.92.
11. The wetting agent according to claim 1 , wherein components a), b) and c) are present in amounts of:
a) from 8 to 25% by weight,
b) from 1.5 to 4% by weight, and
c) from 5 to 15% by weight.
12. The wetting agent according to claim 1 , wherein said wetting agent produces less than 30 ml of foam according to foaming method EN 12728 (40° C., 2 g/l of surfactant, 10° German hardness).
13. The wetting agent according to claim 1 , wherein said wetting agent produces less than 15 ml of foam according to foaming method EN 12728 (40° C., 2 g/l of surfactant, 10° German hardness).Cited by (0)
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